Will 225 R-Comps work properly on a 15"x7" wheel? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Wheels and Tires All things related to Miata Wheels and Tires.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 05-28-2010, 05:00 PM   #1
Junior Member
Thread Starter
 
Join Date: May 2010
Posts: 117
Total Cats: 0
Default Will 225 R-Comps work properly on a 15"x7" wheel?

I have a set of Kosei K1s that I want to put 225 R-Comps on for Track Use. Will a 7" wide wheel hold the tire geometry well enough for track duty?
jsutto13 is offline   Reply With Quote
Old 05-28-2010, 05:02 PM   #2
Elite Member
iTrader: (17)
 
Join Date: Apr 2009
Location: Atlanta, GA
Posts: 2,831
Total Cats: 0
Default

just give them to me! then write it off on your taxes hehe.
WonTon is offline   Reply With Quote
Old 05-28-2010, 05:31 PM   #3
Senior Member
iTrader: (23)
 
Join Date: Oct 2009
Location: Chatsworth, SoCal
Posts: 948
Total Cats: 1
Default

What tire? I am shure you can put them on that rim. Have afun doing so and then trying to get them off is going to be more fun. What is recommended by the manufacturer? Do some research. I have been told that 205's are to wide for the 7" rim. Do some research.

Have a great day,
Jared
Jfornachon is offline   Reply With Quote
Old 05-28-2010, 09:37 PM   #4
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,107
Total Cats: 518
Default

Yes it'll be fine, 7" is the minimum width tire companies suggest for 225. Or at least that's what I remember from when I researched it, it's been a while. I had 225 toyo proxxes 4's. They worked great and lasted a long time with 5-6 track days, and 20-30k street miles. The grip with them compared to my 185 stock tire/wheel combo was amazing, however there's a noticeable amount of "tossability" lost with the squishier sidewalls. 8" is definitely better but 7" will be fine.
curly is offline   Reply With Quote
Old 05-28-2010, 11:20 PM   #5
Junior Member
Thread Starter
 
Join Date: May 2010
Posts: 117
Total Cats: 0
Default

curly, do you think I will be losing some max grip because of the enlarge sidewall "bulge" caused by the 7s? I'd be curious to know if 8s would help my cornering speeds with tires held constant. I would assume 8s would allow the tires to roll less...
jsutto13 is offline   Reply With Quote
Old 05-30-2010, 06:15 PM   #6
Senior Member
iTrader: (23)
 
Join Date: Oct 2009
Location: Chatsworth, SoCal
Posts: 948
Total Cats: 1
Default

Jsutto13 you are correct. 8's will be a much better size for that tire for all the reasons that you listed above.

Have a great day,
Jared
Jfornachon is offline   Reply With Quote
Old 05-30-2010, 08:01 PM   #7
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,107
Total Cats: 518
Default

Maybe, you're never going to know though. Not $600 in new wheels worth at least.
curly is offline   Reply With Quote
Old 05-30-2010, 08:42 PM   #8
Junior Member
 
Join Date: Aug 2007
Location: Dallas, Tx
Posts: 224
Total Cats: 0
Default

I've had 225 on 15x6.5 Never had any issues.
miatamike is offline   Reply With Quote
Old 05-30-2010, 11:03 PM   #9
Elite Member
iTrader: (1)
 
NA6C-Guy's Avatar
 
Join Date: Feb 2008
Location: Birmingham Alabama
Posts: 8,038
Total Cats: 43
Default

Quote:
Originally Posted by miatamike View Post
I've had 225 on 15x6.5 Never had any issues.
Surely you lost some turn in response or feel some loss of "tossability " like Curly said. 205's on my 6.5'' wheels look and feel too wide, I can't imagine 225's. But I guess sidewall height is the biggest issue probably.
NA6C-Guy is offline   Reply With Quote
Old 05-30-2010, 11:17 PM   #10
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

They will drive like **** and feel like you're driving on balloons with tons of sidewall roll...but it works. After 225's on 15x9, I'll never go back.
hustler is offline   Reply With Quote
Old 05-31-2010, 10:20 AM   #11
Junior Member
 
Join Date: May 2010
Location: Tampa, Florida
Posts: 131
Total Cats: -40
Default

So, will there be any rubbing issues if 15x9's were used with 225's in the rear of a 97 model? Or will the rear fends need bending?
my97miata is offline   Reply With Quote
Old 05-31-2010, 10:54 AM   #12
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by my97miata View Post
So, will there be any rubbing issues if 15x9's were used with 225's in the rear of a 97 model? Or will the rear fends need bending?
yeah, you need to roll fenders big time for the 9's...but its soooo worth it.
hustler is offline   Reply With Quote
Old 06-18-2010, 02:32 PM   #13
Newb
 
Join Date: Jun 2008
Location: Ammon, ID
Posts: 17
Total Cats: 0
Default

Id say just save money and get 205 for your 7". Better width match, less rotational mass. Or you could save up, sell your wheels and step up to that 15x9 225 combo (unless you are class restricted). Mmm, meaty!
UI Vandal is offline   Reply With Quote
Old 06-18-2010, 03:04 PM   #14
Junior Member
 
Join Date: May 2010
Location: Tampa, Florida
Posts: 131
Total Cats: -40
Default

Quote:
Originally Posted by UI Vandal View Post
Id say just save money and get 205 for your 7". Better width match, less rotational mass. Or you could save up, sell your wheels and step up to that 15x9 225 combo (unless you are class restricted). Mmm, meaty!
I plan on adding a turbo in the future, looking at around 225 WHP and possibly more later on. So I'm a bit concerned that 205 width tyres may not be enough.
my97miata is offline   Reply With Quote
Old 06-18-2010, 03:38 PM   #15
Senior Member
iTrader: (12)
 
Join Date: Nov 2005
Location: Murfreesboro, TN
Posts: 596
Total Cats: 3
Default

Yes they will work fine. I have mounted 275's on a 6" wheel before for a friend with and Integra Type R.
sbrian2 is offline   Reply With Quote
Old 07-04-2010, 08:43 AM   #16
Senior Member
iTrader: (7)
 
Join Date: Nov 2009
Location: Mount Prospect, IL
Posts: 678
Total Cats: 3
Default

We've been using Hoosier 225 45 15s on 15x7 rims for 3 years now for NASA Time Trials (have 6 track records with that car too) so they work just fine!
chris101 is offline   Reply With Quote
Old 07-05-2010, 08:37 AM   #17
Senior Member
iTrader: (7)
 
Join Date: Nov 2009
Location: Mount Prospect, IL
Posts: 678
Total Cats: 3
Default

Quote:
Originally Posted by oneslammed10ae View Post
they will fit but handle like **** and look like crap

This is false information.

After 2 years of using 225 45 15s on 15x7s, we opted to finally buy a pair of 15x8s and mount up the 225 45 15s on them (hoosier r6 rcompound tires). The Visible and measured difference of 'contact patch' was between 1/4th and 1/2 inch (closer to 1/2 inch) BUT there was no difference in feel driving on one or the other AND in our case, we did not see better lap times with the 15x8s vs. the 15x7s using the same exact tires. NOTE, however, that in our case the 15x8s wheels were 2 pounds heavier than the 15x7s so that may have helped account for the same lap times for both. (same day, same track, same driver)
chris101 is offline   Reply With Quote
Old 07-06-2010, 01:23 AM   #18
Senior Member
iTrader: (2)
 
Join Date: Jan 2010
Location: Denver
Posts: 909
Total Cats: 14
Default

Quote:
Originally Posted by chris101 View Post
This is false information.

After 2 years of using 225 45 15s on 15x7s, we opted to finally buy a pair of 15x8s and mount up the 225 45 15s on them (hoosier r6 rcompound tires). The Visible and measured difference of 'contact patch' was between 1/4th and 1/2 inch (closer to 1/2 inch) BUT there was no difference in feel driving on one or the other AND in our case, we did not see better lap times with the 15x8s vs. the 15x7s using the same exact tires. NOTE, however, that in our case the 15x8s wheels were 2 pounds heavier than the 15x7s so that may have helped account for the same lap times for both. (same day, same track, same driver)
not to mention how stiff the sidewalls are on hoosier r6's
hingstonwm is offline   Reply With Quote
Old 07-06-2010, 01:27 AM   #19
Senior Member
iTrader: (8)
 
Join Date: Mar 2006
Location: Indianapolis, IN
Posts: 758
Total Cats: 5
Default

Quote:
Originally Posted by miatamike View Post
I've had 225 on 15x6.5 Never had any issues.
x2. Although not optimal, they worked well enough for me to win my class in a divisional autocross championship(Great Lakes Solo Series) on my 00 Civic Si.
boileralum is offline   Reply With Quote
Old 07-06-2010, 08:23 AM   #20
Senior Member
iTrader: (7)
 
Join Date: Nov 2009
Location: Mount Prospect, IL
Posts: 678
Total Cats: 3
Default

and our car currently holds 6 Time Trial records with NASA using the 225 45 15s on 15x7 wheels FWIW (and got podium every event even if not getting the record!)
chris101 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
elesjuan's mediocre 95 Miata adventure (google fiber edition) elesjuan Build Threads 8 02-16-2016 09:36 PM
TTE Build - Help me pick tires chrisn Race Prep 27 10-16-2015 06:12 PM
3rd Time's a Charm...hopefully. zephyrusaurai Meet and Greet 2 09-28-2015 11:59 PM
ME221 Now has Autotune and Long Term Fuel Trim Tables Motorsport-Electronics ECUs and Tuning 0 09-05-2015 09:02 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 10:58 PM.